Re: [PATCH v2] mm: Move page_mapping_file to pagemap.h

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On Wed, Mar 17, 2021 at 12:30:11PM +0000, Matthew Wilcox (Oracle) wrote:
> page_mapping_file() is only used by some architectures, and then it
> is usually only used in one place.  Make it a static inline function
> so other architectures don't have to carry this dead code.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>

Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>

> ---
> v2: Ensure pagemap.h is included in all the files which use page_mapping_file
>  arch/arm/mm/copypage-v4mc.c   |  1 +
>  arch/arm/mm/copypage-v6.c     |  1 +
>  arch/arm/mm/copypage-xscale.c |  1 +
>  arch/csky/abiv1/cacheflush.c  |  1 +
>  arch/mips/mm/cache.c          |  1 +
>  arch/nios2/mm/cacheflush.c    |  1 +
>  arch/sh/mm/cache-sh4.c        |  1 +
>  arch/sh/mm/cache-sh7705.c     |  1 +
>  arch/sparc/mm/tlb.c           |  1 +
>  include/linux/mm.h            |  1 -
>  include/linux/pagemap.h       | 10 ++++++++++
>  mm/util.c                     | 10 ----------
>  12 files changed, 19 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/arm/mm/copypage-v4mc.c b/arch/arm/mm/copypage-v4mc.c
> index 44f7292ec27b..f1da3b439b96 100644
> --- a/arch/arm/mm/copypage-v4mc.c
> +++ b/arch/arm/mm/copypage-v4mc.c
> @@ -13,6 +13,7 @@
>  #include <linux/init.h>
>  #include <linux/mm.h>
>  #include <linux/highmem.h>
> +#include <linux/pagemap.h>
> 
>  #include <asm/tlbflush.h>
>  #include <asm/cacheflush.h>
> diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c
> index 6a769a6c314e..d8a115de5507 100644
> --- a/arch/arm/mm/copypage-v6.c
> +++ b/arch/arm/mm/copypage-v6.c
> @@ -8,6 +8,7 @@
>  #include <linux/spinlock.h>
>  #include <linux/mm.h>
>  #include <linux/highmem.h>
> +#include <linux/pagemap.h>
> 
>  #include <asm/shmparam.h>
>  #include <asm/tlbflush.h>
> diff --git a/arch/arm/mm/copypage-xscale.c b/arch/arm/mm/copypage-xscale.c
> index eb5d338657d1..bcb485620a05 100644
> --- a/arch/arm/mm/copypage-xscale.c
> +++ b/arch/arm/mm/copypage-xscale.c
> @@ -13,6 +13,7 @@
>  #include <linux/init.h>
>  #include <linux/mm.h>
>  #include <linux/highmem.h>
> +#include <linux/pagemap.h>
> 
>  #include <asm/tlbflush.h>
>  #include <asm/cacheflush.h>
> diff --git a/arch/csky/abiv1/cacheflush.c b/arch/csky/abiv1/cacheflush.c
> index 9f1fe80cc847..07ff17ea33de 100644
> --- a/arch/csky/abiv1/cacheflush.c
> +++ b/arch/csky/abiv1/cacheflush.c
> @@ -4,6 +4,7 @@
>  #include <linux/kernel.h>
>  #include <linux/mm.h>
>  #include <linux/fs.h>
> +#include <linux/pagemap.h>
>  #include <linux/syscalls.h>
>  #include <linux/spinlock.h>
>  #include <asm/page.h>
> diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
> index 7719d632df8d..a7bf0c80371c 100644
> --- a/arch/mips/mm/cache.c
> +++ b/arch/mips/mm/cache.c
> @@ -15,6 +15,7 @@
>  #include <linux/syscalls.h>
>  #include <linux/mm.h>
>  #include <linux/highmem.h>
> +#include <linux/pagemap.h>
> 
>  #include <asm/cacheflush.h>
>  #include <asm/processor.h>
> diff --git a/arch/nios2/mm/cacheflush.c b/arch/nios2/mm/cacheflush.c
> index 65de1bd6a760..6aa9257c3ede 100644
> --- a/arch/nios2/mm/cacheflush.c
> +++ b/arch/nios2/mm/cacheflush.c
> @@ -11,6 +11,7 @@
>  #include <linux/sched.h>
>  #include <linux/mm.h>
>  #include <linux/fs.h>
> +#include <linux/pagemap.h>
> 
>  #include <asm/cacheflush.h>
>  #include <asm/cpuinfo.h>
> diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
> index ddfa9685f1ef..72c2e1b46c08 100644
> --- a/arch/sh/mm/cache-sh4.c
> +++ b/arch/sh/mm/cache-sh4.c
> @@ -16,6 +16,7 @@
>  #include <linux/mutex.h>
>  #include <linux/fs.h>
>  #include <linux/highmem.h>
> +#include <linux/pagemap.h>
>  #include <asm/mmu_context.h>
>  #include <asm/cache_insns.h>
>  #include <asm/cacheflush.h>
> diff --git a/arch/sh/mm/cache-sh7705.c b/arch/sh/mm/cache-sh7705.c
> index 4c67b3d88775..9b63a53a5e46 100644
> --- a/arch/sh/mm/cache-sh7705.c
> +++ b/arch/sh/mm/cache-sh7705.c
> @@ -13,6 +13,7 @@
>  #include <linux/mman.h>
>  #include <linux/mm.h>
>  #include <linux/fs.h>
> +#include <linux/pagemap.h>
>  #include <linux/threads.h>
>  #include <asm/addrspace.h>
>  #include <asm/page.h>
> diff --git a/arch/sparc/mm/tlb.c b/arch/sparc/mm/tlb.c
> index 20ee14739333..9a725547578e 100644
> --- a/arch/sparc/mm/tlb.c
> +++ b/arch/sparc/mm/tlb.c
> @@ -9,6 +9,7 @@
>  #include <linux/mm.h>
>  #include <linux/swap.h>
>  #include <linux/preempt.h>
> +#include <linux/pagemap.h>
> 
>  #include <asm/tlbflush.h>
>  #include <asm/cacheflush.h>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index fbe0843daa90..f69a72f63e44 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1645,7 +1645,6 @@ static inline pgoff_t page_index(struct page *page)
> 
>  bool page_mapped(struct page *page);
>  struct address_space *page_mapping(struct page *page);
> -struct address_space *page_mapping_file(struct page *page);
> 
>  /*
>   * Return true only if the page has been allocated with
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index 08fa117f405c..f68fe61c1dec 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -162,6 +162,16 @@ static inline void filemap_nr_thps_dec(struct address_space *mapping)
> 
>  void release_pages(struct page **pages, int nr);
> 
> +/*
> + * For file cache pages, return the address_space, otherwise return NULL
> + */
> +static inline struct address_space *page_mapping_file(struct page *page)
> +{
> +	if (unlikely(PageSwapCache(page)))
> +		return NULL;
> +	return page_mapping(page);
> +}
> +
>  /*
>   * speculatively take a reference to a page.
>   * If the page is free (_refcount == 0), then _refcount is untouched, and 0
> diff --git a/mm/util.c b/mm/util.c
> index 143c627fb3e8..972e7a0cda5e 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -711,16 +711,6 @@ struct address_space *page_mapping(struct page *page)
>  }
>  EXPORT_SYMBOL(page_mapping);
> 
> -/*
> - * For file cache pages, return the address_space, otherwise return NULL
> - */
> -struct address_space *page_mapping_file(struct page *page)
> -{
> -	if (unlikely(PageSwapCache(page)))
> -		return NULL;
> -	return page_mapping(page);
> -}
> -
>  /* Slow path of page_mapcount() for compound pages */
>  int __page_mapcount(struct page *page)
>  {
> -- 
> 2.30.1
> 

-- 
Sincerely yours,
Mike.




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